ok i know back in the day in americas army we could hex edit the shit of the .u files and get things like no recoil by for instance changing a value the was 01 to say 02 and that would be that. I know its more dificult to create a trainer ...but my question is has anyone created a trainer for aa ...and could anyone give me any ideas ...for stealth trainers or any tutorials /links /flames /whatever you have enough time to type

I think the best example for what you are looking for would be Evilhack. Its all over the AA section of the forums. If you are looking for information you should check out www.gamehacking.com they have a lot of info when it comes to making trainers.